From 3886749b1c8d79d4701bf6b8e66249c4e1491648 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sun, 4 Jan 2026 18:06:31 +0800
Subject: dev(shell): implement basic shell tools fixed(file-system): fixed
 read and write bugs

---
 src/user/sh.cc | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

(limited to 'src/user/sh.cc')

diff --git a/src/user/sh.cc b/src/user/sh.cc
index b4122f7..760f29e 100644
--- a/src/user/sh.cc
+++ b/src/user/sh.cc
@@ -67,11 +67,26 @@ struct RedirCommand : public Command
     void run() override
     {
         close(fd);
-        if (open(file, mode) < 0)
+
+        int newfd = open(file, mode);
+
+        if (newfd < 0)
         {
             printf("open %s failed\n", file);
             exit(1);
         }
+
+        if (newfd != fd)
+        {
+
+            if (dup(newfd) != fd)
+            {
+                printf("Redirection failed: could not move fd %d to %d\n", newfd, fd);
+                exit(1);
+            }
+            close(newfd);
+        }
+
         sub_cmd->run();
     }
 };
@@ -348,15 +363,6 @@ int main()
 {
     static char buf[100];
 
-    // int fd;
-    // while ((fd = open("console", O_RDWR)) >= 0)
-    // {
-    //     if (fd >= 3)
-    //     {
-    //         close(fd);
-    //         break;
-    //     }
-    // }
 
     printf(ANSI_GREEN"\n[Lume Shell] Welcome! \n"ANSI_RESET);
     printf(ANSI_YELLOW "[Lume Shell] Start your journey of exploration!"ANSI_RESET);
-- 
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